+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <inttypes.h>
-#include <fcntl.h>
-#include <linux/limits.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/select.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <sys/inotify.h>
-
-#include "missing.h"
-#include "util.h"
-#include "set.h"
-#include "sd-daemon.h"
-#include "ioprio.h"
-#include "readahead-common.h"
-#include "virt.h"
-
-static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
-
-static ReadaheadShared *shared = NULL;
-
-static int unpack_file(FILE *pack) {
- char fn[PATH_MAX];
- int r = 0, fd = -1;
- bool any = false;
- struct stat st;
-
- assert(pack);
-
- if (!fgets(fn, sizeof(fn), pack))
- return 0;
-
- char_array_0(fn);
- truncate_nl(fn);
-
- if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) {
-
- if (errno != ENOENT && errno != EPERM && errno != EACCES)
- log_warning("open(%s) failed: %m", fn);
-
- } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
- close_nointr_nofail(fd);
- fd = -1;
- }
-
- for (;;) {
- uint32_t b, c;
-
- if (fread(&b, sizeof(b), 1, pack) != 1 ||
- fread(&c, sizeof(c), 1, pack) != 1) {
- log_error("Premature end of pack file.");
- r = -EIO;
- goto finish;
- }
-
- if (b == 0 && c == 0)
- break;
-
- if (c <= b) {
- log_error("Invalid pack file.");
- r = -EIO;
- goto finish;
- }
-
- log_debug("%s: page %u to %u", fn, b, c);
-
- any = true;
-
- if (fd >= 0)
- if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
- log_warning("posix_fadvise() failed: %m");
- goto finish;
- }
- }
-
- if (!any && fd >= 0) {
- /* if no range is encoded in the pack file this is
- * intended to mean that the whole file shall be
- * read */
-
- if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
- log_warning("posix_fadvise() failed: %m");
- goto finish;
- }
- }
-
-finish:
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- return r;
-}
-
-static int replay(const char *root) {
- FILE *pack = NULL;
- char line[LINE_MAX];
- int r = 0;
- char *pack_fn = NULL;
- int c;
- bool on_ssd, ready = false;
- int prio;
- int inotify_fd = -1;
-
- assert(root);
-
- write_one_line_file("/proc/self/oom_score_adj", "1000");
- bump_request_nr(root);
-
- if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
- log_error("Out of memory");
- r = -ENOMEM;
- goto finish;
- }
-
- if ((!(pack = fopen(pack_fn, "re")))) {
- if (errno == ENOENT)
- log_debug("No pack file found.");
- else {
- log_error("Failed to open pack file: %m");
- r = -errno;
- }
-
- goto finish;
- }
-
- posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
-
- if ((inotify_fd = open_inotify()) < 0) {
- r = inotify_fd;
- goto finish;
- }
-
- if (!(fgets(line, sizeof(line), pack))) {
- log_error("Premature end of pack file.");
- r = -EIO;
- goto finish;
- }
-
- char_array_0(line);
-
- if (!streq(line, CANONICAL_HOST "\n")) {
- log_debug("Pack file host type mismatch.");
- goto finish;
- }
-
- if ((c = getc(pack)) == EOF) {
- log_debug("Premature end of pack file.");
- r = -EIO;
- goto finish;
- }
-
- /* We do not retest SSD here, so that we can start replaying
- * before udev is up.*/
- on_ssd = c == 'S';
- log_debug("On SSD: %s", yes_no(on_ssd));
-
- if (on_ssd)
- prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
- else
- prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7);
-
- if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
- log_warning("Failed to set IDLE IO priority class: %m");
-
- sd_notify(0, "STATUS=Replaying readahead data");
-
- log_debug("Replaying...");
-
- if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
- log_debug("Got termination request");
- goto done;
- }
-
- while (!feof(pack) && !ferror(pack)) {
- uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
- int k;
- ssize_t n;
-
- if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
- if (errno != EINTR && errno != EAGAIN) {
- log_error("Failed to read inotify event: %m");
- r = -errno;
- goto finish;
- }
- } else {
- struct inotify_event *e = (struct inotify_event*) inotify_buffer;
-
- while (n > 0) {
- size_t step;
-
- if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
- log_debug("Got termination request");
- goto done;
- }
-
- step = sizeof(struct inotify_event) + e->len;
- assert(step <= (size_t) n);
-
- e = (struct inotify_event*) ((uint8_t*) e + step);
- n -= step;
- }
- }
-
- if ((k = unpack_file(pack)) < 0) {
- r = k;
- goto finish;
- }
-
- if (!ready) {
- /* We delay the ready notification until we
- * queued at least one read */
- sd_notify(0, "READY=1");
- ready = true;
- }
- }
-
-done:
- if (!ready)
- sd_notify(0, "READY=1");
-
- if (ferror(pack)) {
- log_error("Failed to read pack file.");
- r = -EIO;
- goto finish;
- }
-
- log_debug("Done.");
-
-finish:
- if (pack)
- fclose(pack);
-
- if (inotify_fd >= 0)
- close_nointr_nofail(inotify_fd);
-
- free(pack_fn);
-
- return r;
-}
-
-
-static int help(void) {
-
- printf("%s [OPTIONS...] [DIRECTORY]\n\n"
- "Replay collected read-ahead data on early boot.\n\n"
- " -h --help Show this help\n"
- " --max-file-size=BYTES Maximum size of files to read ahead\n",
- program_invocation_short_name);
-
- return 0;
-}
-
-static int parse_argv(int argc, char *argv[]) {
-
- enum {
- ARG_FILE_SIZE_MAX
- };
-
- static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
- { NULL, 0, NULL, 0 }
- };
-
- int c;
-
- assert(argc >= 0);
- assert(argv);
-
- while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
-
- switch (c) {
-
- case 'h':
- help();
- return 0;
-
- case ARG_FILE_SIZE_MAX: {
- unsigned long long ull;
-
- if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
- log_error("Failed to parse maximum file size %s.", optarg);
- return -EINVAL;
- }
-
- arg_file_size_max = (off_t) ull;
- break;
- }
-
- case '?':
- return -EINVAL;
-
- default:
- log_error("Unknown option code %c", c);
- return -EINVAL;
- }
- }
-
- if (optind != argc &&
- optind != argc-1) {
- help();
- return -EINVAL;
- }
-
- return 1;
-}
-
-int main(int argc, char*argv[]) {
- int r;
- const char *root;
-
- log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
- log_parse_environment();
- log_open();
-
- umask(0022);
-
- if ((r = parse_argv(argc, argv)) <= 0)
- return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
-
- root = optind < argc ? argv[optind] : "/";
-
- if (!enough_ram()) {
- log_info("Disabling readahead replay due to low memory.");
- return 0;
- }
-
- if (detect_virtualization(NULL) > 0) {
- log_info("Disabling readahead replay due to execution in virtualized environment.");
- return 0;
- }
-
- if (!(shared = shared_get()))
- return 1;
-
- shared->replay = getpid();
- __sync_synchronize();
-
- if (replay(root) < 0)
- return 1;
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff